Exactly the same with an uncle. Took years to admit it to family but in doing so, I found I wasn't the only one. Telling someone might prevent it from happening to another cousin, but if it happened to you, it may have happened to them too, and you could support each other knowing this. If you're sure it hasn't affected you yet, it likely won't later, but it can anyone else he's done this to, so he needs to be stopped.